Torque required to shear titanium

I am trying to workout how much torque from a motor is required to shear Ti64 plate.

I have an upper platen which is rotated by a motor. The upper platen is compressed against titanium plate at 19kN.

I am simulating sliding during forming process and need a motor to be able to turn the upper platen agaisnt the titanium whilst heavily loaded. For worst case scenario I think it best to determine the torque required to shear the plate (ie the platen is completely fixed to the titanium plate).